- SafetyPay
- SampoPankki
- Santander
- Saudi Riyal
- Sberbank Online
- SBGC S.R.L.
- SBTech
- Scotiabank
- SEB Pank
- Sepa
- Serbian
- Serbian Dinar
- ServiPag
- Singapore Dollar
- Siru Mobile
- SkillOnNet Limited
- Skrill
- Skrill Rapid Transfer
- Skrill1-Tap
- Slot Races
- Slots Bonuses
- Slovak
- Slovenian
- Smartico
- SnapScan
- Sofort Banking
- Sofortuberweisung
- Soft Gamings
- Soft2Bet
- SoftSwiss
- Solo Payment System
- South African
- South African English
- South African Rand
- South Korean Won
- Spanish
- Sparbanken
- Special Bonus
- Speedcard
- Spinomenal
- SporoPay
- Sri Lankan Rupee
- SSC ENTERTAINMENT N.V.
- Steam
- Sticpay
- Suomen Verkkomaksut
- Superior Share
- Superior VIP Group
- Svyaznoy
- Swedbank
- Swedish
- Swedish Kronor
- Swiss Franc